Airtight Panels/Canvas
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The thought came to me of a sort of thin paneling with a canvas texture (and maybe a metal frame on the edge to make more visual sense as a block) - airtight but no structural strength, useful for "sealing" areas underground or inside asteroids, especially if generated terrain can't complete an airtight seal by itself.
I believe it would also make some amount of sense lore-wise as there are many kinds of rock, regolith, ice, and dust that would be a bad idea to be touching and living next to unprotected.
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